FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
tscc.c
Go to the documentation of this file.
1 /*
2  * TechSmith Camtasia decoder
3  * Copyright (c) 2004 Konstantin Shishkov
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * TechSmith Camtasia decoder
25  *
26  * Fourcc: TSCC
27  *
28  * Codec is very simple:
29  * it codes picture (picture difference, really)
30  * with algorithm almost identical to Windows RLE8,
31  * only without padding and with greater pixel sizes,
32  * then this coded picture is packed with ZLib
33  *
34  * Supports: BGR8,BGR555,BGR24 - only BGR8 and BGR555 tested
35  */
36 
37 #include <stdio.h>
38 #include <stdlib.h>
39 
40 #include "avcodec.h"
41 #include "internal.h"
42 #include "msrledec.h"
43 
44 #include <zlib.h>
45 
46 typedef struct TsccContext {
47 
50 
51  // Bits per pixel
52  int bpp;
53  // Decompressed data size
54  unsigned int decomp_size;
55  // Decompression buffer
56  unsigned char* decomp_buf;
58  int height;
59  z_stream zstream;
60 
61  uint32_t pal[256];
63 
64 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
65  AVPacket *avpkt)
66 {
67  const uint8_t *buf = avpkt->data;
68  int buf_size = avpkt->size;
69  CamtasiaContext * const c = avctx->priv_data;
70  AVFrame *frame = c->frame;
71  int ret;
72 
73  if ((ret = ff_reget_buffer(avctx, frame)) < 0)
74  return ret;
75 
76  ret = inflateReset(&c->zstream);
77  if (ret != Z_OK) {
78  av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
79  return AVERROR_UNKNOWN;
80  }
81  c->zstream.next_in = buf;
82  c->zstream.avail_in = buf_size;
83  c->zstream.next_out = c->decomp_buf;
84  c->zstream.avail_out = c->decomp_size;
85  ret = inflate(&c->zstream, Z_FINISH);
86  // Z_DATA_ERROR means empty picture
87  if ((ret != Z_OK) && (ret != Z_STREAM_END) && (ret != Z_DATA_ERROR)) {
88  av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret);
89  return AVERROR_UNKNOWN;
90  }
91 
92 
93  if (ret != Z_DATA_ERROR) {
95  c->decomp_size - c->zstream.avail_out);
96  ff_msrle_decode(avctx, frame, c->bpp, &c->gb);
97  }
98 
99  /* make the palette available on the way out */
100  if (c->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
102 
103  if (pal) {
104  frame->palette_has_changed = 1;
105  memcpy(c->pal, pal, AVPALETTE_SIZE);
106  }
107  memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
108  }
109 
110  if ((ret = av_frame_ref(data, frame)) < 0)
111  return ret;
112  *got_frame = 1;
113 
114  /* always report that the buffer was completely consumed */
115  return buf_size;
116 }
117 
119 {
120  CamtasiaContext * const c = avctx->priv_data;
121  int zret; // Zlib return code
122 
123  c->avctx = avctx;
124 
125  c->height = avctx->height;
126 
127  // Needed if zlib unused or init aborted before inflateInit
128  memset(&c->zstream, 0, sizeof(z_stream));
129  switch(avctx->bits_per_coded_sample){
130  case 8: avctx->pix_fmt = AV_PIX_FMT_PAL8; break;
131  case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
132  case 24:
133  avctx->pix_fmt = AV_PIX_FMT_BGR24;
134  break;
135  case 32: avctx->pix_fmt = AV_PIX_FMT_0RGB32; break;
136  default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i bpp\n", avctx->bits_per_coded_sample);
137  return AVERROR_PATCHWELCOME;
138  }
139  c->bpp = avctx->bits_per_coded_sample;
140  // buffer size for RLE 'best' case when 2-byte code precedes each pixel and there may be padding after it too
141  c->decomp_size = (((avctx->width * c->bpp + 7) >> 3) + 3 * avctx->width + 2) * avctx->height + 2;
142 
143  /* Allocate decompression buffer */
144  if (c->decomp_size) {
145  if (!(c->decomp_buf = av_malloc(c->decomp_size))) {
146  av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
147  return AVERROR(ENOMEM);
148  }
149  }
150 
151  c->zstream.zalloc = Z_NULL;
152  c->zstream.zfree = Z_NULL;
153  c->zstream.opaque = Z_NULL;
154  zret = inflateInit(&c->zstream);
155  if (zret != Z_OK) {
156  av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
157  return AVERROR_UNKNOWN;
158  }
159 
160  c->frame = av_frame_alloc();
161 
162  return 0;
163 }
164 
166 {
167  CamtasiaContext * const c = avctx->priv_data;
168 
169  av_freep(&c->decomp_buf);
170  av_frame_free(&c->frame);
171 
172  inflateEnd(&c->zstream);
173 
174  return 0;
175 }
176 
178  .name = "camtasia",
179  .long_name = NULL_IF_CONFIG_SMALL("TechSmith Screen Capture Codec"),
180  .type = AVMEDIA_TYPE_VIDEO,
181  .id = AV_CODEC_ID_TSCC,
182  .priv_data_size = sizeof(CamtasiaContext),
183  .init = decode_init,
184  .close = decode_end,
185  .decode = decode_frame,
186  .capabilities = AV_CODEC_CAP_DR1,
187 };
#define NULL
Definition: coverity.c:32
This structure describes decoded (raw) audio or video data.
Definition: frame.h:180
int ff_msrle_decode(AVCodecContext *avctx, AVFrame *pic, int depth, GetByteContext *gb)
Decode stream in MS RLE format into frame.
Definition: msrledec.c:249
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int size
Definition: avcodec.h:1576
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1868
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
unsigned char * decomp_buf
Definition: tscc.c:56
AVCodec.
Definition: avcodec.h:3532
z_stream zstream
Definition: tscc.c:59
uint8_t
#define av_cold
Definition: attributes.h:82
#define av_malloc(s)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:140
8 bit with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:374
static av_cold int decode_init(AVCodecContext *avctx)
Definition: tscc.c:118
static AVFrame * frame
uint8_t * data
Definition: avcodec.h:1575
static void inflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord)
Definition: vf_neighbor.c:129
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:3033
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:153
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
const char * name
Name of the codec implementation.
Definition: avcodec.h:3539
AVCodecContext * avctx
Definition: tscc.c:48
GetByteContext gb
Definition: tscc.c:57
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...
Definition: utils.c:977
AVCodec ff_tscc_decoder
Definition: tscc.c:177
int width
picture width / height.
Definition: avcodec.h:1827
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:65
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1640
void * buf
Definition: avisynth_c.h:553
uint32_t pal[256]
Definition: tscc.c:61
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:324
AVFrame * frame
Definition: tscc.c:49
unsigned int decomp_size
Definition: tscc.c:54
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:194
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:722
common internal api header.
if(ret< 0)
Definition: vf_mcdeint.c:282
static double c[64]
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:326
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
void * priv_data
Definition: avcodec.h:1682
static av_cold int decode_end(AVCodecContext *avctx)
Definition: tscc.c:165
int height
Definition: tscc.c:58
#define av_freep(p)
uint8_t * av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int *size)
Get side information from packet.
Definition: avpacket.c:320
This structure stores compressed data.
Definition: avcodec.h:1552
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:951
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: tscc.c:64
#define AV_PIX_FMT_0RGB32
Definition: pixfmt.h:319